US4502924A - Method for repairing a mold for continuous casting of steel - Google Patents

Method for repairing a mold for continuous casting of steel Download PDF

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Publication number
US4502924A
US4502924A US06/412,973 US41297382A US4502924A US 4502924 A US4502924 A US 4502924A US 41297382 A US41297382 A US 41297382A US 4502924 A US4502924 A US 4502924A
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US
United States
Prior art keywords
nickel
mold
base alloy
acid
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/412,973
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English (en)
Inventor
Kenji Minami
Yoshimasa Kawata
Tetsuji Ushio
Hoshiro Tani
Kazuhisa Mitani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mishima Kosan Co Ltd
Nippon Steel Corp
Original Assignee
Mishima Kosan Co Ltd
Nippon Steel Corp
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Publication date
Application filed by Mishima Kosan Co Ltd, Nippon Steel Corp filed Critical Mishima Kosan Co Ltd
Assigned to MISHIMA KOSAK COMPANY, LIMITED reassignment MISHIMA KOSAK COMPANY, LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KAWATA, YOSHIMASA, MINAMI, KENJI, MITANI, KAZUHISA, TANI, HOSHIRO, USHIO, TETSUJI
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/057—Manufacturing or calibrating the moulds
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/38—Pretreatment of metallic surfaces to be electroplated of refractory metals or nickel
    • C25D5/40—Nickel; Chromium

Definitions

  • This invention relates to a method for repairing a mold for continuous casting of steel.
  • the mold for continuous casting is made of copper or copper-alloy body with a nickel or nickel-base alloy layer plated thereon. Sometimes a chromium layer may additionally be plated on said plated layer. When the surface plated layer is worn and scratched in use, it is usually subjected to a repairing operation.
  • the conventional way of repairing was to completely abrade and remove all the nickel or nickel-base alloy layer from the surface and thereafter apply a new surface thereon.
  • FIG. 1 shows an example where a nickel or nickel-base alloy layer 2 and a chromium layer 3 have been applied to the surface of a mold body 1 made of copper or copper alloy.
  • the abrading operation is made to the extent of a plane A--A of FIG. 1 to remove the entire plated layer and thereafter form a new plated layer thereon. It is because there has been an insufficient adhesion problem between the two metals of the same kind plated on each other and a degradation problem in use of the nickel or nickel-base alloy plated layer.
  • the thickness of the nickel or nickel-base alloy plated layer applied to the lower surface of the mold body tends to become greater nowadays as the speed of the continuous casting becomes faster.
  • the abrading of the surface of a mold has been conducted independent of the degradation of its plated layer and, therefore, it is obviously undesirable, from the view point of the mold costs and the material savings, to remove all parts of the layer including a part which can fully be reused.
  • the adhesion power between the new and old plated layers in the mold for continuous casting of steel necessitates at least 20 kg/mm 2 and the fluctuation in this case must be ⁇ n ⁇ 3.0 where ⁇ n is the standard deviation. This means that so long as the known method is followed, there is a tendency that many materials may be dipped, which must be improved.
  • a strong acid having acid concentration of at least 40 wt.% may be used.
  • the strong acid may be nitric acid having a concentration of 60 wt.% or more.
  • the strong acid may be one containing at least 50 vol.% of nitric acid of at least 60 wt.% concentration, the rest being at least one member selected from the group consisting of sulfuric acid, hydrochloric acid, hydrofluoric acid, phosphoric acid and aqueous hydrogen peroxide.
  • a mold for continuous casting made of copper or copper alloy, having two or more layers of nickel or nickel-base alloy on at least a part of its surface.
  • FIGS. 1 to 4 are schematic views of examples of the structure of the body and its surface plated layer of molds for continuous casting of steel, to which this invention may be applied respectively.
  • FIG. 1 shows an example of the structure wherein a layer 2 of nickel or nickel-base alloy of uniform thickness is provided over the entire surface of the mold body 1 made of copper or copper alloy and a chromium layer 3 is also provided in the outermost layer.
  • FIG. 2 shows an example of the structure wherein a lower part of the nickel or nickel-base alloy layer 2 has a stepwise increased thickness.
  • FIG. 3 shows an example of the structure wherein the nickel or nickel-base alloy layer 2 becomes gradually thicker downwardly.
  • FIG. 4 shows an example of the structure wherein the nickel or nickel-base alloy layer 2 is provided only on the lower half of the mold.
  • the work nickel-base alloy herein used indicates an alloy containing nickel as a main component and at least one element such as Co, Fe, Mn, Cr, W, C, B and P, etc.
  • a sufficient heat removal effect is required at its surface of contact with molten steel.
  • a solidified shell is formed at the meniscus in the upper part of a mold and then passed through the mold, it is designed such that the thickness of the shell can stand the static pressure of the molten steel.
  • One of the factors which have effect upon the life of a mold having above function is the wear or abrasion between the solidified shell and the lower part of the mold.
  • the solidified shell is brought into direct contact with a mold body or copper or copper alloy, there occur minute cracks called "star crack" on the surface of the cast piece which will cause the lowering of yield of the cast piece. Therefore, the lower part of a mold is in many cases provided with a thicker cover or layer than the upper part of it.
  • the abrading operation is effected to the planes, C--C, D--D and E--E, respectively and the resulting abraded surface is plated with the nickel or nickel-base alloy layer 2 over its entire surface or over its lower surface only.
  • the plating operation used in this invention may be electroplating or non-electroplating.
  • Samples No. 1, No. 3 and No. 7 are comparative examples while Samples No. 2, No. 4, No. 5 and No. 6 are examples of this invention.
  • the abrading is carried out to the extent of B--B, and the roughness of the exposed surface is kept at 0.006 mm or less.
  • the exposed surface is uniformly prepared to be rough by "wet-honing" with hones of particle size #20 in alkali solution.
  • said exposed surface is degreased with (1) a solvent (toluene+ethanol) and then with (2) an alkali (concentration 100 g/l, liquid temperature 60° C.) and dipped with (3) acid (HCl, 10 wt.%).
  • the “concentrated strong acid” used in this invention means one having its acid concentration of at least 40 wt.%. Its composition may be nitric acid only (its concentration: 60 wt.% or more), or may consist of at least 50 vol.% of nitric acid (its concentration: 60 wt.% or more) and the rest one member or more selected from sulfuric acid, hydrochloric acid, hydrofluoric acid, phosphoric acid and aqueous hydrogen peroxide.
  • the value of the adhesive power by shearing between the nickel and the nickel-base alloy is affected largely by the conditions of the exposed surface on which the plating is conducted for repair, and that the excellent results can be given in case the treatments are conducted according to this invention, that is, in the samples Nos. 2, 4, 5 and 6.
  • the passivated film on the abraded nickel or nickel-base alloy surface is treated with concentrated strong acid such as nitric acid of at least 60 wt.% concentration.
  • the adhesive power of the nickel or nickel-base alloy plated layer applied to the activated exposed surface shows about twice the value of the conventional sample No. 1 with respect to the temperature range between the normal temperature and 500° C. Also as compared with other comparative examples (samples No. 3 and No. 7), said adhesive power is far greater than those of samples No. 3 and No. 7 and Normal temperature, and its fluctuation is also smaller than said samples.
  • the present invention will enable the art to obviate unnecessary abrading operation with respect to the expensive nickel or nickel-base alloy plated layer and yet to provide tight adhesion between the new and old plated layers with few fluctuation, which increase the life of the cover and of the mold material to a great extent.
  • the present invention can thus provide an extremely useful method for repairing a mold for continuous casting of steel.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Electroplating Methods And Accessories (AREA)
US06/412,973 1981-09-01 1982-08-27 Method for repairing a mold for continuous casting of steel Expired - Fee Related US4502924A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56-138081 1981-09-01
JP56138081A JPS5838637A (ja) 1981-09-01 1981-09-01 連続鋳造用鋳型の補修方法

Publications (1)

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US4502924A true US4502924A (en) 1985-03-05

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US06/412,973 Expired - Fee Related US4502924A (en) 1981-09-01 1982-08-27 Method for repairing a mold for continuous casting of steel

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US (1) US4502924A (enrdf_load_stackoverflow)
JP (1) JPS5838637A (enrdf_load_stackoverflow)
AU (1) AU550630B2 (enrdf_load_stackoverflow)
BR (1) BR8205097A (enrdf_load_stackoverflow)
DE (1) DE3231444A1 (enrdf_load_stackoverflow)
ES (2) ES515313A0 (enrdf_load_stackoverflow)
FR (1) FR2513910B1 (enrdf_load_stackoverflow)
GB (1) GB2107355B (enrdf_load_stackoverflow)
IT (1) IT1154332B (enrdf_load_stackoverflow)
NL (1) NL8203300A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696723A (en) * 1984-05-11 1987-09-29 N.V. Verenigde Energiebedrijven Van Het Scheldeland Mechelsesteenweg Process for repairing the tubes of a steam generator
US4802436A (en) * 1987-07-21 1989-02-07 Williams Gold Refining Company Continuous casting furnace and die system of modular design
US5788824A (en) * 1996-04-12 1998-08-04 Usinor Sacilor (Societe Anonyme) Process for conditioning the copper or copper-alloy external surface of an element of a mold for the continuous casting of metals, of the type including a nickel plating step and a nickel removal step
US20030080092A1 (en) * 2001-10-30 2003-05-01 International Business Machines Corporation Rework method for finishing metallurgy on chip carriers
RU2270075C1 (ru) * 2004-06-25 2006-02-20 Государственное образовательное учреждение высшего профессионального образования "Московский государственный институт стали и сплавов" (технологический университет) Способ восстановления рабочих стенок кристаллизатора
US20120058004A1 (en) * 2005-12-16 2012-03-08 Michiharu Hasegawa Metal mold repair method and metal mold repair paste agent

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1215386B (it) * 1987-03-18 1990-02-08 Danieli Off Mecc Procedimento di recupero per cristallizzatore di lingottiera per colata continua.
DE4128365A1 (de) * 1991-08-27 1993-03-04 Egon Evertz Verfahren zur aufarbeitung von kupferkokillen fuer das stranggiessen von stahl
CN102909325B (zh) * 2012-11-12 2014-07-16 南昌航空大学 一种激光－感应复合熔覆修复连铸结晶器的方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB617689A (en) * 1945-10-25 1949-02-10 Mond Nickel Co Ltd Improvements relating to the electro deposition of nickel on nickel
GB825928A (en) * 1955-07-29 1959-12-23 Napier & Son Ltd Electrolytically coating thin nickel alloy wires with metal
US2965551A (en) * 1956-08-08 1960-12-20 Pechiney Prod Chimiques Sa Metal plating process
GB1299850A (en) * 1969-12-31 1972-12-13 Sifco Ind Inc Repair of chromium plated surfaces
US3963588A (en) * 1975-04-21 1976-06-15 United States Steel Corporation Coalescent-jet apparatus and method for high current density preferential electroplating
US4037646A (en) * 1975-06-13 1977-07-26 Sumitomo Metal Industries, Ltd. Molds for continuously casting steel
US4055472A (en) * 1976-09-15 1977-10-25 United Aircraft Products, Inc. Method of preparing nickel alloy parts for plating
US4144993A (en) * 1977-09-20 1979-03-20 Mishima Kosan Co., Ltd. Method of producing a continuous casting mold

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB617689A (en) * 1945-10-25 1949-02-10 Mond Nickel Co Ltd Improvements relating to the electro deposition of nickel on nickel
GB618322A (en) * 1945-10-25 1949-02-21 Mond Nickel Co Ltd Improvements relating to the electrodeposition of nickel on nickel
GB825928A (en) * 1955-07-29 1959-12-23 Napier & Son Ltd Electrolytically coating thin nickel alloy wires with metal
US2965551A (en) * 1956-08-08 1960-12-20 Pechiney Prod Chimiques Sa Metal plating process
GB1299850A (en) * 1969-12-31 1972-12-13 Sifco Ind Inc Repair of chromium plated surfaces
US3963588A (en) * 1975-04-21 1976-06-15 United States Steel Corporation Coalescent-jet apparatus and method for high current density preferential electroplating
US4037646A (en) * 1975-06-13 1977-07-26 Sumitomo Metal Industries, Ltd. Molds for continuously casting steel
GB1496623A (en) * 1975-06-13 1977-12-30 Sumitomo Metal Ind Moulds for continuously casting steel
US4055472A (en) * 1976-09-15 1977-10-25 United Aircraft Products, Inc. Method of preparing nickel alloy parts for plating
GB1534120A (en) * 1976-09-15 1978-11-29 United Aircraft Prod Method of preparing nickel alloy parts for plating
US4144993A (en) * 1977-09-20 1979-03-20 Mishima Kosan Co., Ltd. Method of producing a continuous casting mold

Non-Patent Citations (8)

* Cited by examiner, † Cited by third party
Title
ASTM B 343 79 Standard Practice for Preparation of Nickel for Electroplating with Nickel. *
ASTM B 343-79 Standard Practice for Preparation of Nickel for Electroplating with Nickel.
ASTM B 558 79 Standard Practice for Preparation of Nickel Alloys for Electroplating. *
ASTM B 558-79 Standard Practice for Preparation of Nickel Alloys for Electroplating.
Graham, Electroplating Engineering Handbook, 3rd Edition, pp. 184 186. *
Graham, Electroplating Engineering Handbook, 3rd Edition, pp. 184-186.
Modern Electroplating, Wiley Interscience, Third Edition, 1974, pp. 583 587. *
Modern Electroplating, Wiley-Interscience, Third Edition, 1974, pp. 583-587.

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696723A (en) * 1984-05-11 1987-09-29 N.V. Verenigde Energiebedrijven Van Het Scheldeland Mechelsesteenweg Process for repairing the tubes of a steam generator
US4802436A (en) * 1987-07-21 1989-02-07 Williams Gold Refining Company Continuous casting furnace and die system of modular design
US5788824A (en) * 1996-04-12 1998-08-04 Usinor Sacilor (Societe Anonyme) Process for conditioning the copper or copper-alloy external surface of an element of a mold for the continuous casting of metals, of the type including a nickel plating step and a nickel removal step
AU707062B2 (en) * 1996-04-12 1999-07-01 Thyssen Stahl Aktiengesellschaft Process for conditioning the copper or copper-alloy external surface of an element of a mould for the continuous casting of metals, of the type including a nickel plating step and a nickel removal step
US20030080092A1 (en) * 2001-10-30 2003-05-01 International Business Machines Corporation Rework method for finishing metallurgy on chip carriers
US6838009B2 (en) 2001-10-30 2005-01-04 International Business Machines Corporation Rework method for finishing metallurgy on chip carriers
RU2270075C1 (ru) * 2004-06-25 2006-02-20 Государственное образовательное учреждение высшего профессионального образования "Московский государственный институт стали и сплавов" (технологический университет) Способ восстановления рабочих стенок кристаллизатора
US20120058004A1 (en) * 2005-12-16 2012-03-08 Michiharu Hasegawa Metal mold repair method and metal mold repair paste agent
US8236088B2 (en) * 2005-12-16 2012-08-07 Honda Motor Co., Ltd. Metal mold repair method and metal mold repair paste agent

Also Published As

Publication number Publication date
BR8205097A (pt) 1983-08-09
FR2513910A1 (fr) 1983-04-08
NL8203300A (nl) 1983-04-05
GB2107355A (en) 1983-04-27
AU8743582A (en) 1983-03-10
IT1154332B (it) 1987-01-21
IT8249048A0 (it) 1982-08-30
AU550630B2 (en) 1986-03-27
ES8404796A1 (es) 1984-05-16
JPS5838637A (ja) 1983-03-07
FR2513910B1 (fr) 1985-09-13
ES526015A0 (es) 1985-04-16
GB2107355B (en) 1985-03-20
DE3231444A1 (de) 1983-08-11
ES8503989A1 (es) 1985-04-16
ES515313A0 (es) 1984-05-16
JPS6152238B2 (enrdf_load_stackoverflow) 1986-11-12

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AS Assignment

Owner name: NIPPON STEEL CORPORATION, NO. 6-3, OHTEMACHI 2-CHO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:MINAMI, KENJI;KAWATA, YOSHIMASA;USHIO, TETSUJI;AND OTHERS;REEL/FRAME:004043/0950

Effective date: 19820810

Owner name: MISHIMA KOSAK COMPANY, LIMITED, NO. 1-15, EDAMITSU

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:MINAMI, KENJI;KAWATA, YOSHIMASA;USHIO, TETSUJI;AND OTHERS;REEL/FRAME:004043/0950

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